mdw@git.distorted.org.uk Git - xtoys/blob - xscsize.c

   1 /* -*-c-*-
   2  *
   3  * Return X display size to shell script
   4  *
   5  * (c) 1998 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the Edgeware X tools collection.
  11  *
  12  * X tools is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * X tools is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with X tools; if not, write to the Free Software Foundation,
  24  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  */
  26
  27 /*----- Header files ------------------------------------------------------*/
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include <X11/Xlib.h>
  34
  35 #include <mLib/mdwopt.h>
  36 #include <mLib/quis.h>
  37
  38 /*----- Main code ---------------------------------------------------------*/
  39
  40 static void version(FILE *fp)
  41   { fprintf(fp, "%s (xtoys version " VERSION ")\n", QUIS); }
  42
  43 static void usage(FILE *fp)
  44   { fprintf(fp, "Usage: %s [-bcx] [-d display]\n", QUIS); }
  45
  46 static void help(FILE *fp)
  47 {
  48   version(fp);
  49   fputc('\n', fp);
  50   usage(stdout);
  51   fputs("\n"
  52 "Reads the size of the X root window and outputs it in a form suitable\n"
  53 "for use as a shell assignment statement, defining variables XWIDTH and\n"
  54 "XHEIGHT.\n"
  55 "\n"
  56 "Options:\n"
  57 "\n"
  58 "-h, --help             Display this help text\n"
  59 "-u, --usage            Display a short usage summary\n"
  60 "-v, --version          Display the program's version number\n"
  61 "\n"
  62 "-d, --display=DISPLAY  Choose X display to connect to\n"
  63 "-b, --bourne-shell     Output text suitable for a Bourne shell\n"
  64 "-c, --c-shell          Output text suitable for a C shell\n"
  65 "-x, --export           Export the variables into the environment\n",
  66         fp);
  67 }
  68
  69 int main(int argc, char *argv[])
  70 {
  71   Display *dpy;
  72   const char *s;
  73   const char *display = 0;
  74   unsigned f = 0;
  75   unsigned long wd, ht;
  76   int sc;
  77
  78 #define f_sh 1u
  79 #define f_csh 2u
  80 #define f_shell 3u
  81 #define f_export 4u
  82
  83   /* --- Parse command line options --- */
  84
  85   ego(argv[0]);
  86
  87   for (;;) {
  88     static struct option opt[] = {
  89       { "help",         0,              0,      'h' },
  90       { "usage",        0,              0,      'u' },
  91       { "version",      0,              0,      'v' },
  92       { "display",      OPTF_ARGREQ,    0,      'd' },
  93       { "bourne-shell", 0,              0,      'b' },
  94       { "c-shell",      0,              0,      'c' },
  95       { "export",       0,              0,      'x' },
  96       { 0,              0,              0,      0 }
  97     };
  98
  99     int i = getopt_long(argc, argv, "huv d:bcx", opt, 0);
 100     if (i < 0)
 101       break;
 102     switch (i) {
 103       case 'h':
 104         help(stdout);
 105         exit(0);
 106         break;
 107       case 'u':
 108         usage(stdout);
 109         exit(0);
 110         break;
 111       case 'v':
 112         version(stdout);
 113         exit(0);
 114         break;
 115
 116       case 'd':
 117         display = optarg;
 118         break;
 119       case 'b':
 120         f |= f_sh;
 121         break;
 122       case 'c':
 123         f |= f_csh;
 124         break;
 125       case 'x':
 126         f |= f_export;
 127         break;
 128       default:
 129         usage(stderr);
 130         exit(EXIT_FAILURE);
 131         break;
 132     }
 133   }
 134
 135   /* --- Sort out the shell type --- *
 136    *
 137    * If the shell name contains the string `csh' then assume it's a C shell.
 138    * Otherwise assume it's Bourne.  This seems to work in practice.
 139    */
 140
 141   if (!(f & f_shell)) {
 142     s = getenv("SHELL");
 143     if (!s)
 144       f |= f_sh;
 145     if (strstr(s, "csh"))
 146       f |= f_csh;
 147     else
 148       f |= f_sh;
 149   }
 150
 151   if ((f & f_sh) && (f & f_csh)) {
 152     fprintf(stderr, "xscsize: make your mind up about your shell type\n");
 153     exit(EXIT_FAILURE);
 154   }
 155
 156   /* --- Get the important information --- */
 157
 158   dpy = XOpenDisplay(display);
 159   if (!dpy) {
 160     fprintf(stderr, "xscsize: couldn't open display\n");
 161     exit(EXIT_FAILURE);
 162   }
 163   sc = DefaultScreen(dpy);
 164   wd = DisplayWidth(dpy, sc);
 165   ht = DisplayHeight(dpy, sc);
 166   XCloseDisplay(dpy);
 167
 168   /* --- Do the output thing --- */
 169
 170   if (f & f_sh) {
 171     printf("XWIDTH=%lu XHEIGHT=%lu", wd, ht);
 172     if (f & f_export)
 173       printf("; export XWIDTH XHEIGHT");
 174   }
 175   if (f & f_csh) {
 176     if (f & f_export)
 177       printf("setenv XWIDTH %lu; setenv XHEIGHT %lu", wd, ht);
 178     else
 179       printf("set XWIDTH=%lu XHEIGHT=%lu", wd, ht);
 180   }
 181   putchar('\n');
 182
 183   /* --- Done --- */
 184
 185   return (0);
 186 }
 187
 188 /*----- That's all, folks -------------------------------------------------*/